60 REPTILES. 
scales: nostrils semilunar, superior, valvular, in the middle of a 
nasal shield: eyes moderate, rather superior; pupil round: body 
elongate, rather compressed, covered with small, polished, six-sided, 
imbricate scales: belly compressed, strongly keeled: ventral shields 
band-like, transverse ; sides folded together, with a central notch in 
the middle of the hinder edge: tail strongly compressed, oblong, co- 
vered with a series of more or less broad transverse scales ; the upper 
and lower edge strongly keeled, and covered with folded scales ; the 
tip torn, covered with a single, large, eompressed, conical scale. 
Stephanohydra, Tschudi, Wiegm. Arch. iii. 331, 1837. Hypo- 
trophis, Gray, Ann. and Mag. Nat. Hist. 1846, in Jukes’ Narrat. 
Voyage of H.M.S. Fly, ii. 334. Hydrophis sp., Schlegel. 
Tschudi’s snake from the Celebes is evidently the same as Mr. 
Jukes’. The figure and Latin description do not represent or men- 
tion the large size nor the keeled form of the ventral shield, which 
induced me (as it appears to have done M. Schlegel) to regard it as 
Hydrophis, which had not come under my examination. 
1. Juxes’ Hyporrornis. Stephanohydra fusca, Tschudi, 
Wiegm. Arch. Naturg. iii. 332, t. 8, 1837. _Hypotrophis Jukesii, 
Gray, Ann. & Mag. Nat. Hist. 1846, and in Jukes’ Narrat. Voy. Fly, 
ii. 334, ¢. 1. Hydrophis pelamoides, var., Schlegel, Abbild, ii. 5. 
Pale olive-brown in spirits, rather paler beneath. 
a. In spirits (without bones of body). Length 5 feet. Darnley 
Islands. Presented by J. B. Jukes, Esq. 
B. The head covered with scales like the body. The nostrils sur- 
rounded by a small continued ring. Eyes surrounded by a series 
of small scales. Labial shields serrated, with a larger series above 
them. Pupil round. Ventral shields very small, scale-like, sepa- 
rate, on each side of a keeled ridge. Rivers. Acrochordina. 
Hemiophis, fam. Nectophis, Fitz. Syst. Rept. 1842. Colu- 
broidea pars, and Bungaroidea, Fitz. N. Syst. Rept. 29, 31, 1826. 
Les Boas pars, genus Acrochordus, Schlegel, Phys. Serp. 425. Pho- 
lidophides, fam. 1, Atryphodonto pholidophides. 2. Chalinipholi- 
dophides, Ritgen, Nov. Act. Nat. Cur. xiv. 1828, 259. Achrochor- 
dine, Bonap. Amp. Eur. 7. 
12. CHERSYDRUS. 
Tail compressed, prehensile, sword-shaped: body fusiform, 
covered with small rhombic scales with a central tubercular keel. 
